I’ll cross that bridge when I come to it

idiom:

An expression that means you will not worry about a possible future problem but will deal with it if it happens (Cambridge Dictionary, 2021)

Question: How does a hare cross a river?

Answer: Why, using the footbridge, of course!

So, you’ve arrived at the ford at Branton, and you want to cross the River Breamish. You don’t have a 4×4 vehicle, and you haven’t brought your waders. Oh…and you’re a hare!

Well, the answer’s simple, silly – you just use the footbridge like everyone else!

You just take one step/leap after another and soon you’ll be across – and in double-quick time, ‘cos you’re a hare and you can, well, run fast!